i think it's important that you mention safety hazards in building this. with so much tension in the tube, the frame is pretty likely to be uprooted and fly backward. even one of the connections of the tube to the frame can pop off and hit you. and, as with any siege, engine, you have to make sure that no one is anywhere NEAR where you're launching. i think you should mention these in the actual instructable and not just in the comments, especially about making a very strong, very secure frame. include instructions on how to do it safely, not just saying to get one.other than that, very good idea and seriously, it needs a video. it's cruel to post something like this on the internet and not include a video.

About the safety hazards ill do that, but that is what the disclaimer is for. But seriously I'll talk about the safety hazards. I did say to never aim at any living thing. But about the video i am currently trying to find time to do that.

The original was given to me from my cousin and he said it was his but it was not. However I did build my own but since my camera stinks and I have to take pictures from my computer using a webcam which I cannot move because it is one of those old computers that take up a lot of space and are really heavy. I might build a pinhole camera to take he picture.

My early-teen daughter got hit in the face with a water balloon. After a couple months of eyedrops and a bunch of opthalmologist visits, you couldn't see the little pool of blood at the bottom of her iris anymore. (mind you, this was paranoid and precautionary; there were never any noticeable vision problems. But that "you'll poke your eye out" cliche is only amusing when it hasn't come close to happening.)

there are rumors that the amazing-race clip is a fake (waterballoon instead of a watermellon, etc) I think that even so, she was pretty lucky not to have been more seriously hurt...